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High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes
SJR: 0.176 SNIP: 0.48 CiteScore™: 1.3

ISSN Print: 1093-3611
ISSN Online: 1940-4360

High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes

DOI: 10.1615/HighTempMatProc.v3.i2-3.20
pages 157-166

ANALYSIS OF THE SPONTANEOUS OSCILLATIONS OF THE VOLTAGE OF AN ARC BURNING ON HETEROGENEOUS ELECTRODES BY CURRENT INJECTION

J. L. Doremieux
CNRS-CECM 15 Rue Georges Urbain 94407 VITRY cedex
R. Haug
Universite PARIS XI, Laboratoire de Physique des Gaz et des Plasmas, Equipe DEE SUPELEC Plateau du Moulon 91190 Gif-sur-Yvette

ABSTRACT

It has been shown that large amplitude voltage oscillations may be present in free burning arcs in special conditions. These conditions concern the cathode nature, the ambient gas, the gap length, the arc current. To investigate the origin of these oscillations, we inject in an oscillating arc a stepwise current pulse, and record the induced arc voltage variations Depending on the sign of the injected current ΔI vs. arc current I, and on the relative time position of the current injection vs. voltage level, we observe either stable arc behaviour, with a voltage variation proportional to the injected current : ΔU = ui ΔI/I, where ui is the voltage drop in the plasma, or sensitive unstable levels where the voltage exhibits anomalous large amplitude variations. In this latter case, with ΔI > 0, the arc voltage shifts towards the higher level for a short period, then rapidly falls to the lower level. For the stable arc case, we compute the minimum arc voltage and the arc impedance.


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